More than 100 wildfires are active in Canada, including nearly 200 in northern Ontario, with smoke carried southeast into U.S. states. The 1.1-million-acre Boundary Waters Canoe Area Wilderness was closed after 17 lightning-caused fires spread for over a week, while air quality alerts were issued across Michigan, Minnesota, New York, and Washington, D.C. A freight train was halted by flames in Canada with no reported injuries to workers.